package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件的上传和下载
 */
@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     *
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){//这里起名要和前端保持一致
        log.info(file.toString());
// 获取原始文件名 user.jpg     file.getOriginalFilename()
        String originalFilename = file.getOriginalFilename();
// 获取文件后缀名
// 字符串截取 .jpg   substring
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        // 文件名： uuid作为文件名
        String fileName=UUID.randomUUID()+suffix;

//判断文件夹是否存在，不存在则创建
        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }

//将文件存储到指定的位置 file.transferTo(new File(path,fileName+suffixName));
        try{
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

//上传成功，返回文件名 fileName+suffixName
        return R.success(fileName);

    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            response.setContentType("image/jpeg");
            FileInputStream fileInputStream =
                    new FileInputStream(new File(basePath,name));
            ServletOutputStream outputStream = response.getOutputStream();
            IOUtils.copy(fileInputStream,outputStream);
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}
